Two suspicious packages addressed to former Vice President Joe Biden were found in two Delaware post offices Thursday morning, one at Quigley Boulevard near New Castle and another at Lancaster Avenue in Wilmington, law enforcement officials confirmed.

The news came a day after a number of high-profile Democratic leaders and supporters were targeted nationwide.

The FBI confirmed in a tweet that the packages addressed to Biden, and another sent to actor Robert De Niro, were similar to the crude pipe bombs sent on Wednesday to former President Barack Obama and Hillary Clinton, among others.

Authorities said Wednesday's pipe bombs were packed with shards of glass and were intercepted. None detonated, and no one was hurt, USA Today reported.

Biden spokesman Bill Russo declined to comment and referred questions to the FBI. It was unclear Thursday if Biden was in Delaware or traveling.

A police sweep of Biden's Greenville home turned up nothing on Wednesday, but on Thursday morning, police responded to two post offices in New Castle County.

If you have info that could assist the #FBI's investigation of suspicious packages, call 1-800-CALLFBI (225-5324) or use https://t.co/iL7sD5efWD. If you observe suspicious activity that requires an immediate response, call 911 or contact local law enforcement immediately. pic.twitter.com/ZsFLKvXrKy

Delaware State Police confirmed that it responded to the Quigley Boulevard post office in Hares Corner at 5:51 a.m. with FBI special agents, USPS Inspection Service and New Castle County Police.

The agency did not release more details.

Shortly before 10 a.m., a bomb disposal unit left the Hares Corner location, which also serves as a processing facility that at one time handled about 200,000 pieces of mail each weekday.

Staff from Avenue Medical Construction, directly behind the Hares Corner post office, said they were evacuated from the building by police about 6:45 a.m. They retreated to a nearby Wawa until about 9 a.m.

Postal Police remained outside of the U.S. Post Service Delaware Processing and Distribution Center in New Castle off Quigley Blvd. on Thursday morning after law enforcement investigated another suspicious package potentially targeting former Vice President Joe Biden.(Photo: Jennifer Corbett, The News Journal)

“It was quite an ordeal this morning. A little scary,” said one employee, who did not want her name used.

The employee double-checked the locks on the back of the building facing the post office just to make sure no one could get in. The heavy, steel loading door would protect them against a bomb, she thought, but not the aluminum loading door. Looking at the post office she said, "normally this place is popping."

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Police tape wrapped around the front of the U.S. Post Office on Lancaster Ave. where law enforcement investigating a suspicious package sent to former Vice President Joe Biden on Thursday morning. Jennifer Corbett, The News Journal

A City of Wilmington police officer stands outside the closed U.S. Post Office on Lancaster Avenue Thursday while law enforcement investigates a suspicious package sent to former Vice President Joe Biden. Jennifer Corbett, The News Journal

A City of Wilmington police K-9 patrol vehicle outside the closed U.S. Post Office on Lancaster Avenue Thursday while law enforcement investigates a suspicious package sent to former Vice President Joe Biden. Jennifer Corbett, The News Journal

Law enforcement at the closed U.S. Post Office on Lancaster Avenue Thursday while law enforcement investigates a suspicious package sent to former Vice President Joe Biden. Jennifer Corbett, The News Journal

Pedestrians walk past a closed U.S. Post Office on Lancaster Ave. Thursday while law enforcement investigates a suspicious package sent to former Vice President Joe Biden. Jennifer Corbett, The News Journal

Customers resume business after law enforcement closed the post office in New Castle off Quigley Boulevard on Thursday morning to investigate another suspicious package addressed to former Vice President Joe Biden. Jennifer Corbett, The News Journal

Postal Police remained outside of the U.S. Postal Service Delaware Processing and Distribution Center in New Castle off Quigley Boulevard on Thursday morning after law enforcement investigated another suspicious package addressed to former Vice President Joe Biden. Jennifer Corbett, The News Journal

A single police vehicle sits outside the gates to former Vice President Joe Biden's Greenville home on Thursday morning after another suspicious package was being investigated at the post office in New Castle. Jennifer Corbett, The News Journal

The post office has a large campus where mail trucks were pulling in and out all morning. Avenue Medical Construction staff said all the trucks were being searched as they arrived and before they left.

The scene outside the Lancaster Avenue post office in Wilmington was quiet.

Behind the facility, a handful of neighbors and postal employees milled around outside the police tape at the closed-off Chestnut Street office. One woman, who declined to talk to a reporter, greeted an arriving co-worker.

"Just go home," she told him.

Patty Dailey Lewis, executive director of The Beau Biden Foundation, said the organization had not received any suspicious packages Thursday morning. She said the foundation had been in touch with the former vice president's office in regard to security.

"We have wonderful support and great security," she said. "We are safe."

A single police vehicle sits outside the gates to former Vice President Joe Biden's Greenville home on Thursday morning after another suspicious package was being investigated at the U.S. Postal office in New Castle of Quigley Blvd. (Photo: Jennifer Corbett, The News Journal)

Katie Wilson, a spokeswoman for Sen. Tom Carper, said in an email that his office is engaging with local law enforcement to ensure the safety of the senator and his staff.

The office of Rep. Lisa Blunt Rochester received information from U.S. Capitol Police Wednesday about suspicious packages and what to look for, spokesman Kyle Morse said in an email. He said the office is taking precautions and has spoken with Wilmington Police and the U.S. Marshals Service.

Police said Thursday morning that a suspicious package was also sent to a building in New York City that houses the Tribeca Grill, started by actor De Niro, and his Tribeca Film Center, according to USA Today.

Just before noon Thursday, the Cannon House Office Building in Washington D.C. was briefly evacuated.

Matt Doc, a Delawarean who works in the building for Congresswoman Debbie Dingell, a Michigan Democrat, was in the building at the time of the evacuation.

"Yes, I’m safe, I work in Cannon and was in my office when the alarms went off and we just left the building immediately. We’re about a block away," Doc responded in a tweet to a CNN reporter.

In another post, Doc retweeted that the United State Capitol Police were investigating.

Capitol Police and the Architect of the Capitol investigated the issue and determined a malfunctioning electrical panel was the cause, according to the Roll Call. There were no reports of smoke or fire, according to a Capitol Police statement.

"My hope is that this recent spate of these — who knows exactly what they were — these pipe bombs being mailed might wake everybody in my business up a bit and realize that we have to begin to put this country back together again," he said.